Doing bootloader development on the GTA01 is a bit more tricky. first, we don't have any NOR flash. Second, there is no other way to boot _but_ from NAND. Therefore, we also don't have a USB downloader like the QT2410.

The main problem is: The [[S3C2410 Steppingstone]] unconditionally copies the first 4k of flash into its internal SRAM. That SRAM segment stays unconditionally mapped at physical address zero. How do we get around this

u-boot needs bootable images (such as kernels, but also initrd and others) in form of a so-called ''uImage''. In order to create a ''uImage'' from e.g. a ''vmlinux'' kernel image, you can proceed as follows:

Just by connecting the phone in u-boot mode to your Linux pc should make it detect a [[CDC ACM]] device, and you should get a new tty device called /dev/ttyACM0. If not, enable the CONFIG_USB_ACM (Device Drivers -> USB support -> USB Modem (CDC ACM) support). (Instructions for MacOS users are [[MacOS_X#USB_Serial|here]])

Use your favourite terminal emulator (minicom, cu, zc, screen ...) to access it like any other serial port. If you don't have a favorite, try just: (cu is in the taylor-uucp package, use "apt-get install cu" if it is not yet installed)

If the boot loader menu is on the screen, the phone will power off when there hasn't been activity for a while. This is not nice if you are working on the boot loader console, but you can make the time longer:

Autofast is a feature of the PCF50606 PMU. It means that the fast_cccv mode will be automatically selected if a charger with suitable voltage is plugged in, and the battery not in over temperature condition.

{{warning|This is potentially dangerous. Only enable autofast if you ARE SURE that you can draw 500mA from the USB connector. This is the case with a wall outlet charger, or if you are attached to a self-powered hub or a desktop PC root hub. Bus powered hubs and some laptops only provide 100mA on their USB ports and can thus not support fast charging}}

The problem disappeared at least for me by the command below on the host side. Please note that if you have usb keyboard or mouse then the command might cause trouble.. I only have PS/2 so I couldn't test it.

GTA01

Doing bootloader development on the GTA01 is a bit more tricky. first, we don't have any NOR flash. Second, there is no other way to boot _but_ from NAND. Therefore, we also don't have a USB downloader like the QT2410.

The main problem is: The S3C2410 Steppingstone unconditionally copies the first 4k of flash into its internal SRAM. That SRAM segment stays unconditionally mapped at physical address zero. How do we get around this

While in this state, your Neo1973 can be charged with a generic USB charger. You also need to set 'setenv boot_menu_timeout 65000' to keep it from powering down, though.

Bootlader Kommandozeile

Accessing the bootloader prompt

The bootloader prompt is available either on the serial console (via Debug Board), or as virtual USB Serial device (USB CDC_ACM).
Whether the serial port or usb is used depends on the u-boot environment variables stdin, stdout and stderr.

Whether or not you use usbtty, the first couple of messages will always be displayed on the serial console.

The bootloader is currently configured to wait for three seconds. If a key press on the stdin is received within those three seconds, auto-boot is aborted.

Nutzung von usbtty unter Linux

Just by connecting the phone in u-boot mode to your Linux pc should make it detect a CDC ACM device, and you should get a new tty device called /dev/ttyACM0. If not, enable the CONFIG_USB_ACM (Device Drivers -> USB support -> USB Modem (CDC ACM) support). (Instructions for MacOS users are here)

Use your favourite terminal emulator (minicom, cu, zc, screen ...) to access it like any other serial port. If you don't have a favorite, try just: (cu is in the taylor-uucp package, use "apt-get install cu" if it is not yet installed)

cu -l /dev/ttyACM0

You might need to

chown uucp.uucp /dev/ttyACM0

to get the necessary right (even as root).

First, you should try to check whether the USB device shows up in 'lsusb' while you're running in u-boot mode:

# lsusb -d 1457:5119
Bus 005 Device 079: ID 1457:5119

Second, lets see some more details about the available endpoints and configurations:

Timeouts

If the boot loader menu is on the screen, the phone will power off when there hasn't been activity for a while. This is not nice if you are working on the boot loader console, but you can make the time longer:

setenv boot_menu_timeout [seconds]

After the phone is powered on, there is a short period of time when you can connect to the console and cancel the automatic boot without going to the menu:

While in this state, your Neo1973 can be charged with a generic USB charger. You also need to set

setenv boot_menu_timeout 65000
saveenv

to keep it from powering down, though.

Einschalten / Ausschalten der automatischen Aufladung

Autofast is a feature of the PCF50606 PMU. It means that the fast_cccv mode will be automatically selected if a charger with suitable voltage is plugged in, and the battery not in over temperature condition.

WARNING: This is potentially dangerous. Only enable autofast if you ARE SURE that you can draw 500mA from the USB connector. This is the case with a wall outlet charger, or if you are attached to a self-powered hub or a desktop PC root hub. Bus powered hubs and some laptops only provide 100mA on their USB ports and can thus not support fast charging

You can enable or disable autofast by

neo1973 charger autofast

and

neo1973 charger !autofast

respectively.

Hintergrundbeleuchtung

You can switch the backlight on and off by using

neo1973 backlight on

and

neo1973 backlight off

respectively.

Vibrator

You can switch the vibrator on and off by using

neo1973 vibrator on

and

neo1973 vibrator off

respectively.

GSM

Starting with OpenMoko patchset SVN revision 2885, u-boot contains support for powering the GSM modem,
and even accessing the modem from the console.

GSM power

You can switch the GSM modem on and off by using

neo1973 gsm on

and

neo1973 gsm off

respectively.

Terminal Modus

You can access the GSM modem using openmoko's built-in terminal emulator in u-boot.

USB connectivity problems

The problem disappeared at least for me by the command below on the host side. Please note that if you have usb keyboard or mouse then the command might cause trouble.. I only have PS/2 so I couldn't test it.